19 free developer tools that run entirely in your browser. No server, no signup, no tracking — your data never leaves your device. Includes JSON formatter, EXIF metadata viewer & remover, JWT decoder, SQL formatter, Cron parser, Regex tester, QR generator, CSV↔JSON, Diff checker, Code minifier, and 9 more. 🔒 100% client-side ⚡ Instant, dark theme 💰 Free forever 🔓 Open source: github.com/Linanxi12/devbox-tools